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Temperatures below 0°C fixed #2

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Temperatures below 0°C fixed #2

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10 changes: 9 additions & 1 deletion firmware/SparkFunRHT03.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,15 @@ int RHT03::update()
if (checksum(dataBytes[CHECKSUM], dataBytes, 4))
{
_humidity = ((uint16_t) dataBytes[HUMIDITY_H] << 8) | dataBytes[HUMIDITY_L];
if(_humidity & 0x8000) {
_humidity -= 0x7FFF;
_humidity *= -1;
}
_temperature = ((uint16_t) dataBytes[TEMP_H] << 8) | dataBytes[TEMP_L];
if(_temperature & 0x8000) {
_temperature -= 0x7FFF;
_temperature *= -1;
}
return 1;
}
else
Expand Down Expand Up @@ -135,4 +143,4 @@ bool RHT03::waitForRHT(int pinState, unsigned int timeout)
return false;
else
return true;
}
}